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The recommendations for daily intake vary between 12-15 mg per day for men or 8-12 mg for women, and the UL (tolerable upper intake) is 40 mg. A low dose zinc supplement should be all that is needed to prevent a deficiency, although up to 30 mg is commonly taken with relative safety.
This means that, for an adult, taking more than 40 milligrams of zinc daily is too much. For children between 9 and 13 years of age, more than 23 milligrams of zinc is too much. Adolescents between 14 and 18 years should not consume more than 34 milligrams daily. Consuming more than the UL of zinc may cause abdominal cramping, vomiting, diarrhea, severe headaches, nausea and a decreased appetite.